IV bolus without dilution causing hemolysis)
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The trial tested oral administration primarily, and no controlled study has tested subcutaneous injection in humans
J Altern Complement Med 17:827833 Farr SA, Poon HF, Dogrukol-Ak D, Drake J, Banks WA, Eyerman E, Butterfield DA, Morley JE (2003) The antioxidants alpha-lipoic acid and N-acetylcysteine reverse memory impairment and brain oxidative stress in aged SAMP8 mice
Clinical studies have found that using GHK-Cu can improve skin firmness by 20-30% over 12 weeks
They may support recovery by signaling repair pathways, but much of the evidence is still preclinical, so benefits are best described as supportive rather than proven